Pixel 4a (5G) and Pixel 5, Android 11 only. This will not work on Android 12 and Pixel 6 / 6 Pro.
A Magisk module (in testing) to enable 5G for Unlisted Countries, VoLTE switches in the settings and add support for more countries/carriers.
VoLTE still won't work if there is no specific VoTLE mbn file for your carrier.
Download from "Releases" and flash in magisk manager.